| 甘肃某难选金铜氧化矿浮选试验研究 |
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| 引用本文： | 李恒. 甘肃某难选金铜氧化矿浮选试验研究[J]. 黄金科学技术, 2021, 29(1): 164-172. DOI: 10.11872/j.issn.1005-2518.2021.01.114 |
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| 作者姓名： | 李恒 |
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| 作者单位： | 中国有色金属工业西安勘察设计研究院有限公司,陕西 西安 710061 |
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| 基金项目： | 英国子午线矿业公司获得巴西喀巴卡项目;的关键许可 |
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| 摘 要： | 甘肃某难选金铜氧化矿金含量为4.83 g/t,铜含量为1.18％,铜氧化率高达95.87％.铜矿物以难选的硅孔雀石为主,且与脉石矿物关系密切,金与铜矿物呈伴生关系.对原矿工艺矿物学进行了系统的研究,分析了尾矿中铜、金损失的原因.在磨矿细度为-74 μm占80％,Na2S作硫化剂,CuSO4作活化剂,丁基黄药、羟肟酸和2...
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| 关 键 词： | 金铜氧化矿 工艺矿物学 硅孔雀石 硫化浮选 组合捕收剂 金铜精矿 |
| 收稿时间： | 2020-06-22 |
| 修稿时间： | 2020-08-20 |
Experimental Research on Flotation of a Refractory Gold and Copper Oxide Ore in Gansu |
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| Heng LI. Experimental Research on Flotation of a Refractory Gold and Copper Oxide Ore in Gansu[J]. Gold Science and Technololgy, 2021, 29(1): 164-172. DOI: 10.11872/j.issn.1005-2518.2021.01.114 |
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| Authors: | Heng LI |
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| Affiliation: | Xi’an Engineering Investigation and Design Research Institute of China National Non-ferrous Metals Industry Co. ，Ltd. ，Xi’an 710061，Shaanxi，China |
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| Abstract: | Silicon malachite is an extremely refractory copper oxide mineral，and the focus of chrysocolla flotation research is the development of new reagents.However， the selectivity and price factors of new pharmaceuticals restrict their industrial applications.In order to improve the flotation index under the premise of using conventional flotation reagents， it is very important to conduct process mineralogy research on refractory copper oxide ore.A refractory gold-copper oxide ores in Gansu Province contains Au 4.83 g/t and Cu 1.18%. The oxidation rate of Cu is as high as 95.87%.The copper minerals are mainly chrysocolla， which is difficult to select and closely related to gangue minerals.Gold is associated with copper minerals.Based on the study of mineralogy of raw ore process， the causes of copper and gold losses in tailings were analyzed and discussed.Sulfide flotation was adopted.After grinding，the products with fineness less than 74 μm accounted for 80%.Under the conditions of sodium sulfide as curing reagent， copper sulfate as activator， butyl xanthate， hydroxamic acid and No.25 dithiophosphate as collector， the sulfide flotation process adopted is “roughing once，sweeping four times，and regrinding coarse concentrate for three times”.The results show that the gold-copper concentrate with Au grade of 86.65 g/t， Au recovery rate of 89.11%， Cu grade of 16.93%， Cu recovery rate of 71.92%，Ag grade of 216.24 g/t and Ag recovery rate of 87.26% was obtained.Through analysis，it is believed that there are 4 reasons for the loss of copper and gold in tailings.1）The oxidation rate of copper is high， there are many types of copper minerals，and there are differences in floatability，in addition，silicon malachite is the main copper-bearing mineral， and its floatability is not good.2）There is a phenomenon that fine-grained silicon malachite is wrapped in gangue minerals.3） The tailings screening analysis shows that the copper lost in the tailings is of fine grade，therefore， the loss of this part of copper in the tailings is a reasonable loss.4）The gold phase analysis results show that the distribution rate of silicate-coated gold and carbonate-coated gold in the tailings is 76.38%， and the gold lost in the tailings is mainly wrapped in veins stone minerals.Gold-copper concentrates can be pre-oxidized by hot-pressing and non-cyanide to recover gold and copper.This smelting process can provide a certain reference for the development and utilization of gold-copper oxide copper mine. |
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| Keywords: | gold-copper oxide ores processing mineralogy silicon malachite sulfide flotation combined collector gold-copper concentrate |
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